Research sponsored by the Federal Highway Administration (FHWA) is opening up a new world of ultra-high-performance concrete (UHPC), offering the opportunity to build longer-lasting bridges and accelerate the renewal of the nation's highway infrastructure. First developed in the 1990s, UHPC is an advanced cementitious composite material. Compared with conventional concrete materials, it tends to exhibit superior properties, such as exceptional durability, high compressive strength, usable tensile strength and long-term stability. UHPC does not contain coarse aggregate and so does not exhibit the early-age microcracking common in conventional concrete. It also has extremely low permeability.
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